Elsevier

Synthetic Metals

Volume 62, Issue 1, 15 January 1994, Pages 35-40
Synthetic Metals

Blue electroluminescent diodes utilizing blends of poly(p-phenylphenylene vinylene) in poly(9-vinylcarbazole)

https://doi.org/10.1016/0379-6779(94)90196-1Get rights and content

Abstract

We report blue light emission from diodes made from polymer blends composed of poly(p-phenylphenylene vinylene) (PPPV) in a hole-transporting polymer, poly(9-vinylcarbazole) (PVK). The soluble PPPV and PVK allow fabrication of light-emitting diodes (LEDs) by spin-casting the electroluminescent polymer blend from solution at room temperature with no subsequent processing or heat treatment required. The initial devices utilized calcium as the electron-injecting (rectifying) contact on the front surface of a PPPV/PVK film spin-cast onto a glass substrate partially coated with a layer of indium/tin oxide (ITO) as the hole-injecting contact. The LEDs turn on at ∼30 V and have a peak emission wavelength in the blue at 495 nm (at room temperature). The quantum efficiency is measured as a function of PPPV content in the blend; the maximum efficiency is approximately 0.16% photons/electron at a concentration of only 2% PPPV in PVK.

References (23)

  • P.L. Burn et al.

    J. Chem. Soc., Chem. Commun.

    (1992)
  • P.L. Burn et al.

    Nature (London)

    (1992)
  • J.H. Burroughes et al.

    Nature (London)

    (1992)
  • A.R. Brown et al.

    Appl. Phys. Lett.

    (1992)
  • G. Grem et al.

    Adv. Mater.

    (1992)
  • Y. Ohmori et al.

    Jpn. J. Appl. Phys.

    (1991)
  • Y. Ohmori et al.

    Solid State Commun.

    (1991)
  • Y. Ohmori et al.

    Jpn. J. Appl. Phys.

    (1992)
  • D. Braun et al.

    J. Appl. Phys.

    (1992)
  • D. Braun et al.

    Appl. Phys. Lett.

    (1991)
  • Z. Yang et al.

    Macromolecules

    (1993)

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